Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/06—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P21/00—Drugs for disorders of the muscular or neuromuscular system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/02—Drugs for disorders of the nervous system for peripheral neuropathies
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
  • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
  • C07D405/06—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
  • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
  • C07D409/06—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
  • C07D417/06—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings

Definitions

• the present invention relates to heteroaryl amines of the formula I below, and pharmaceutically acceptable salts of such compounds.
• the compounds of formula I are acetylcholinesterase inhibitors and are useful in enhancing memory in patients suffering from dementia and Alzheimer's disease.
• Alzheimer's disease is associated with degeneration of cholinergic neurons in the basal forebrain that play a fundamental role in cognitive functions, including memory.
• acetylcholinesterase inhibitors are effective in enhancing cholinergic activity and useful in improving the memory of Alzheimer's patients. By inhibiting acetylcholinesterase enzyme, these compounds increase the level of the neurotransmitter acetylcholine, in the brain and thus enhance memory. Becker et al., supra. report that behavioral changes following cholinesterase inhibition appear to coincide with predicted peak levels of acetylcholine in the brain. They also discuss the efficacy of the three known acetylcholinesterase inhibitors physostigmine, metrifonate, and tetrahydroaminoacridine.
• the present invention relates to compounds of the formula
• R 2 , R 3 and the side chain containing may optionally be attached to the carbon atom designated by an asterisk in ring B rather than to a member of ring A;
• ring A is benzo, thieno, pyrido, pyrazino, pyrimido, furano, seleno, pyrrolo, thiazolo, or imidazolo;
• R 1 is phenyl, phenyl-(C 1 -C 6 )alkyl, cinnamyl or heteroarylmethyl, wherein the heteroaryl moiety of said heteroarylmethyl is selected from imidazolo, thiazolo, thieno, pyrido and isoxazolo, and wherein said phenyl and said heteroaryl moiety may optionally be substituted with one or two substituents independently selected from (C 1 - C 6 )alkyl, (C 1 -C 6 )alkoxy and halo;
• R 2 and R 3 are independently selected from hydrogen, (C 1 - C 6 )alkoxy, (C 1 -C 6 ) alkyl optionally substituted with from one to three fluorine atoms, benzyloxy, hydroxy, phenyl, benzyl, halo, nitro, cyano, COOR 4 , CONHR 4 , NR 4 R 5 , NR 4 COR 5 , or SO p CH 2 - phenyl wherein p is 0, 1 or 2;
• R 2 and R 3 are attached to adjacent carbon atoms and form, together with the carbons to which they are attached, a five or six membered ring wherein each atom of the ring is carbon, nitrogen or oxygen (e.g., a methylenedioxy, ethylenedioxy or lactam ring);
• R 4 and R 5 are independently selected from hydrogen and
• X is nitrogen or CH
• Y is oxygen, sulfur or NR 6 ;
• R 6 is hydrogen, (C 1 -C 6 )alkyl, CO(C 1 -C 6 )alkyl or SO 2 -, phenyl, wherein the phenyl moiety of said SO 2 -phenyl may optionally be substituted with from one to five substituents independently selected from (C 1 -C 4 ) alkyl;
• n is an integer from 1 to 4.
• each q is independently 1 or 2;
• Z is oxygen or sulfur
• the present invention also relates to the pharmaceutically acceptable acid addition salts of compounds of the formula I.
• pharmaceutically acceptable acid addition salts are the salts of hydrochloric acid, p-toluenesulfonic acid, fumaric acid, maleic acid, citric acid, succinic acid, salicylic acid, oxalic acid, hydrobromic acid, phosphoric acid, methanesulfonic acid, tartaric acid, di-p-toluoyl tartaric acid, and mandelic acid.
• This invention further relates to a pharmaceutically composition for inhibiting acetylcholinesterase comprising a compound of the formula I or a pharmaceutically acceptable acid addition salt thereof, and a pharmaceutically acceptable carrier.
• the invention further relates to a method for inhibiting acetylcholinesterase in a mammal comprising administering to a mammal an amount of a compound of the formula I or a pharmaceutically acceptable acid addition salt thereof effective in inhibiting acetylcholinesterase.
• the invention further relates to a method for enhancing memory or treating or preventing Alzheimer's disease in a mammal comprising administering to a mammal an amount of a compound of the formula I or a pharmaceutically acceptable acid addition or salt thereof effective in enhancing memory or treating or preventing Alzheimer's disease.
• mamal includes humans.
• halo includes chloro, bromo or fluoro.
• Preferred compounds of this invention are compounds of the formula
• X is CH, CCH 3 , CCH 2 CH 3 or N; Y is NH, NCH 3 , NCH 2 CH 3 , S , O or NSO 2 C 6 H 5 ; R 2 and R 3 are independently selected from the group consisting of
• R 1 is benzyl, methoxybenzyl, fluorobenzyl or a group of the formula
• W is hydrogen, (C 1 -C 6 ) alkyl, phenyl or benzyl.
• Specific preferred compounds of the invention are: 1-(2-methyl-1H-benzimidazol-5-yl)-3-[1-(phenylmethyl)- 4-piperidinyl]-1-propanone;
• Formula I above includes compounds identical to those depicted but for the fact that one or more hydrogen, nitrogen or carbon atoms are replaced by isotopes thereof
• Such compounds are useful as research and diagnostic tools in metabolism pharmacokinetic studies and in binding assays.
• the compounds of formula I may have optical centers and may therefore occur in different isomeric forms.
• the invention includes all isomers of such compounds having formula I, including mixtures thereof.
• Scheme 1 illustrates a method of preparing compounds of the formula I wherein Z is oxygen and the side chain containing is attached to the carbon atom designated by an asterisk in ring B (hereinafter referred to as compounds of the formula I-A).
• a compound of the formula II is reacted with the appropriate compound of formula III in the presence of a base to form the corresponding compound of the formula IV.
• This reaction is usually performed in an appropriate reaction inert solvent at a temperature from about -78°C to about room temperature, preferably from about -78°C to about 0°C.
• Suitable solvents include tetrahydrofuran (THF), ether, toluene, methylene chloride, benzene and dioxane.
• Suitable bases include lithium bis(trimethylsilyl)amide, lithium diisopropylamide, sodium diisopropylamide, sodium bis (trimethylsilyl) amide, n-butyllithium (n-BuLi), s-butyllithium (s-BuLi) and t-butyllithium (t-BuLi).
• the compound of formula IV formed in the foregoing step is then converted into the corresponding compound of formula I-A by reacting it with an oxidizing agent.
• oxidizing agents that may be used are manganese dioxide. chromium trioxide and selenium dioxide. Manganese dioxide is preferred.
• the oxidation is conducted in a reaction inert solvent at a temperature from about room temperature to about 80°C, preferably from about 50°C to about 80°C.
• suitable solvents are methylene chloride, chloroform, ethyl acetate, benzene and toluene.
• the solvent is methylene chloride or benzene.
• Scheme 2 illustrates a method of preparing compounds of the formula I wherein Z is oxygen and n is 2, 3 or 4 (hereinafter referred to as compounds of the formula I-A') and compounds of the formula I wherein n is 2, 3 or 4 and the (CH q ) n group contains at least one carbon-carbon double bond (hereinafter referred to as compounds of the formula I- B).
• the starting materials having the formulae V and VI can be obtained commercially or prepared as described in the literature. (See J. Orq. Chem., 54, 4350 (1989); Tetrahedron. 44, 3195 (1988); Chem. Pharm. Bull., 39, 181 (1991); Chem. Ber., 119. 2069 (1986); and J. Ind. Chem. Soc., 12, 561 (1975).
• a compound of the formula V is reacted with an aldehyde of the formula VI in the presence of a base to form the corresponding compound of formula VII.
• Suitable bases for this reaction include sodium hydride, lithium bis(trimethylsilyl) amide, piperidine, pyrrolidine, lithium diisopropylamide, sodium diisopropylamide, n- butyllithium and s-butyllithium.
• the reaction is usually carried out in a reaction inert solvent such as THF, dimethylformamide (DMF), dioxane, toluene, methylene chloride or ether, with THF, ether or toluene being preferred.
• the reaction temperature may range from about - 78°C to about 40°C and is preferably about -78°C to about 0°C.
• VI is conducted in the presence of a sodium or potassium (C 1 -C 5 )alkoxide, it is preferable to use toluene, DMF, THF or methylene chloride as the solvent, with or without a (C 1 -C 4 ) alcohol, and to conduct the reaction at a temperature from about -40°C and 80°C, more preferably from about 0°C to about room temperature.
• a sodium or potassium (C 1 -C 5 )alkoxide it is preferable to use toluene, DMF, THF or methylene chloride as the solvent, with or without a (C 1 -C 4 ) alcohol, and to conduct the reaction at a temperature from about -40°C and 80°C, more preferably from about 0°C to about room temperature.
• the elimination is typically carried out by reacting the compound of formula VII, in the presence of a base, with a reagent capable of forming a leaving group upon reaction with the hydroxy group of formula VII.
• reagents include acetic anhydride, R 7 SO 2 Cl, R 7 COCl, R 7 OCOCl and R 7 NCO, wherein R 7 is selected from (C 1 -C 4 ) alkyl or phenyl optionally substituted with (C 1 -C 6 ) alkyl, (C 1 -C 4 ) alkoxy or nitro.
• the solvent can be any reaction inert solvent (e.g., methylene chloride, chloroform, THF or toluene).
• the reaction temperature can range from about 0°C to about 60°C, and is preferably about 0°C to about room temperature.
• compounds of the formula I-B may be prepared by reacting the appropriate compound of formula VII with the Burgess Inner salt.
• the Burgess Inner salt may be prepared from chlorosulfonyl isocyanate, methanol and triethylamine, as described in J. Amer. Chem. Soc.. 90, 4744 (1968).
• this reaction is carried out in an inert solvent such as THF, ether, benzene, toluene or dioxane, preferably THF at a temperature from about room temperature to about the reflux temperature of the solvent, preferably from about 50°C to about 80°C.
• the corresponding compound of the formula I-A' is then prepared by hydrogenation of the compound of formula I-B formed in the above step.
• the hydrogenation is accomplished using platinum dioxide or palladium on carbon at a pressure of about 30 psi to about 50 psi.
• Suitable reaction inert solvents include THF, methanol, ethanol, ethyl acetate and mixtures thereof.
• the solvent is a mixture of ethanol and THF or a mixture of ethanol and ethyl acetate.
• the reaction temperature may range from about 0°C to about 60°C. The preferred temperature is about room temperature.
• I-D are those compounds of the formula I wherein ring A is benzo, Y is NR 6 , R 6 is other than hydrogen, X is nitrogen,
• R 3 is hydrogen and R 2 is attached to the carbon atom designated with an asterisk (*) in ring B.
• the resulting compound of formula XII is then cyclized in the presence of an acid to afford the corresponding compound of the formula I-C.
• acids that may be used are acetic acid, a mixture of acetic acid and a (C 1 -C 4 )- alcohol, hydrochloric acid and ether saturated with hydrogen chloride. This reaction is generally conducted at a temperature from about room temperature to about 120°C. Temperatures from about 60°C to about 90°C are preferred.
• An R 6 group may be added to the compound of formula I-C to obtain the corresponding compound having the formula I-D by reacting the appropriate compound of formula I-C with a compound of the formula R 6 L, wherein L is a leaving group.
• This reaction is typically carried out in an inert solvent in the presence of a base at a temperature from about -78°C to about the reflux temperature of the solvent.
• bases include sodium hydride, lithium diisopropylamide, t-butyllithium and potassium t-butoxide.
• Suitable solvents include THF, methylene chloride, benzene, ether, toluene or dioxane.
• the reaction is preferably conducted in THF in the presence of sodium hydride at a temperature from about 0°C to about 30°C.
• Scheme 4 illustrates the preparation of compounds of the formula I wherein Z is sulfur (hereinafter referred to as compounds of the formula I-F) from compounds of the formula I-E.
• This transformation is accomplished by reacting the compound of formula I-E with Lawesson's Reagent (2,4-bis (4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4- disulfide) or phosphorus pentasulfide (P 2 S 5 ).
• this reaction is conducted in a reaction inert solvent such as THF, acetonitrile, chloroform or toluene at a temperature from about room temperature to about 110°C. It is preferably conducted in THF or toluene at a temperature from about 60°C to about 80°C.
• This reaction which affords the corresponding compound of the formula XIV, is generally carried out in a reaction inert solvent such as methylene chloride, chloroform, dichloroethane, THF or toluene, preferably toluene, at a temperature from about 60°C to about 100°C, preferably from about 80°C to about 85°C.
• a reaction inert solvent such as methylene chloride, chloroform, dichloroethane, THF or toluene, preferably toluene
• the reaction temperature may range from about 80°C to about the reflux temperature of the solvent and is preferably about the reflux temperature of the solvent.
• the compound of the formula XV formed in the foregoing step is then alkylated and thus converted into the corresponding compound of formula I by reacting it with a compound of the formula R 1 L, wherein L is a leaving group, in the presence of a base.
• suitable leaving groups are chloro, bromo, iodo, mesylate, tosylate and triflate (OTf).
• Suitable bases include pyridine, triethylamine, dimethylaminopyridine and potassium carbonate. Triethylamine is preferred.
• the alkylation is carried out in a reaction inert solvent such as methylene chloride or DMF, at a temperature from about 0oC to about 100°C, preferably from about room temperature to about 60°C.
• pressure is not critical. Pressures in the range of about 0.5 atm to 3 atm are suitable, and ambient pressure (generally, about one atmosphere) is preferred as a matter of convenience. Also, for those reactions where the preferred temperature varies with the particular compounds reacted, no preferred temperature is stated. For such reactions, preferred temperatures for particular reactants may be determined by monitoring the reaction using thin layer chromatography.
• the compounds of the invention may be administered to a patient by various methods, for example, orally as capsules or tablets, parentally as a sterile solution or suspension, and in some cases, intravenously in the form of a solution.
• the free base compounds of the invention may be formulated and administered in the form of their pharmaceutically acceptable acid addition salts.
• the daily dose of the compounds of the invention is generally in the range of from about 1 to 300 mg/day for the average adult human, and may be administered in single or divided doses.
• the compounds of the invention When incorporated for parenteral administration into a solution or suspension, the compounds of the invention are present in a concentration of at least l weight percent, and preferably between about 4-70 weight percent (based on the total weight of the unit).
• the parenteral dosage unit typically contains between about 5 to 100 mg of active compound(s).
• Compounds of the present invention may be administered orally with an inert diluent or an edible carrier, or they may be enclosed in gelatin capsules or compressed into tablets. Such preparations should contain at least 0.5% of active compound(s), but the concentration may vary depending upon the particular form and may be from 4 to 70 weight percent (based on the total weight of the unit).
• the oral dosage unit typically contains between 1.0 mg to 300 mg of active compound.
• the activity of the compounds of the present invention as acetylcholinesterase inhibitors may be determined by a number of standard biological or pharmacological tests.
• One such procedure for determining cholinesterase inhibition is described by Ellman et al. in "A New and Rapid Colorimetric Determination of Acetylcholinesterase Activity", Biochem. Pharm. 1, 88, (1961).
• the mixture was extracted with 15 mL of ethyl acetate.
• the pH of the water layer was then sequentially adjusted to 3.0, 4.0, 5.0, 6.5, and 8.5 with 1N NaOH, each time extracting with 15 mL of ethyl acetate.
• Mass spectrum 378 (p), 287 (p-91), 172 (p-206) , 91 (p-287 , base peak) .
• Mass spectrum 379.2 (p), 202.3 (p-176.9), 172.3 (p- 206.9), 91.0 (p-288.3, base peak).
• Example 37 The title compound of Example 37 was dissolved in a 50:50 mixture of ethanol and acetic acid and heated to 75°C for 3 hours. The reaction was cooled to room temperature and diluted with water. The pH of the mixture was adjusted to 9.5 and the mixture was extracted with ethyl acetate. The ethyl acetate extracts were dried (Na 2 SO 4 ) and evaporated to yield 0.19 g (45%) of the free base of the title compound.

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